Figure 1From: Variation in the PaO2/FiO2 ratio with FiO2: mathematical and experimental description, and clinical relevanceMathematical models of pulmonary gas exchange. (a) The 'effective shunt' model. (b) The two-parameter shunt and ventilation/perfusion mismatch model. Data describing oxygen transport in the models are indicated: oxygen partial pressure in alveolar air (PAO2), oxygen partial pressure in capillary blood (PcO2), oxygen partial pressure in arterial blood (PaO2), concentration of oxygen in venous blood (CvO2), concentration of oxygen in capillary blood (CcO2), concentration of oxygen in arterial blood (CaO2), cardiac output (Q), shunt parameter (shunt), and parameters describing ventilation/perfusion mismatch (fA2, ΔPO2).Back to article page